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Muscles exhibit the property of excitablity. This means the muscle
responds to stimulation by the nervous system.
Identify the statement concerning general functional characteristics of muscle that is true.
Muscle tissue shortens forcefully but lenghtens passively.
Which of the following actions is caused by contraction of skeletal muscle?
moving your feet and walking.
The sites where a chemical substance is transmitted from the presynaptic terminal of an axon to the postsynaptic membrane of a muscle fiber are called
The outside of the resting plasma membrane is _____ relative to the inside of the resting plasma membrane.
Which of the following situations occurs in electrically excitable cells?
Depolarization causes voltage-gated sodium ion channels to open.
When repolarization of the cell membrane is complete, the
cell no longer has a potential difference across its membrane.
What contains postsynaptic membrane, presynaptic terminal, synaptic cleft and receptors on postsynpatic membrane?
Acetylcholine binds to a membrane bound receptor and causes ligand-gated sodium channels to open and results in
When action potential reaches the presynaptic terminal,
calcium ions diffuse into the presynaptic terminal through voltage-gated ion channels.
Lack of acetycholinestrase in the synaptic cleft would result in
continuous stimulation of the postsynaptic membrane.
Curare blocks acetylcholine receptors at the motor end plate. This would result in
inability of the muscle fiber to respond to nervous stimulation.
A child ingested organophosphate poison used to kill insects. Soon the child's muscles began tetanic contractions. Predict what occured the synpatic cleft.
increased accumulation of acetylcholine in the synapse.
A condition in which stimuli occur so rapidly that there are no intervening relaxations between contractions is called
can contribute to improve muscle efficiency, may be due to an increase in the level of calcium ions around the myofibril, is an example of a graded response, is acheived during warm-up exercises.
Which of the following would contribute to muscular fatigue in the muscle fiber?
depletion of ATP reserves
The type of muscle fatigue known as " psychological fatigue" is the result of
the emotional state of an individual
Which of the following occurs during recovery from oxygen debt?
conversion of excess latic acid to glucose
Oxygen debt represents
the amount of oxygen that cells need to replenish ATP supplies after exercise
The sternocleidomastoid muscle extends from the mastoid process of the temporal bone to the sternum and medial clavical. When both sternocleidomastoid muscles contract, the head is flexed. The end of the muscle that connects to the sternum is the
If abdominal muscles are contracted while the vertebral column is fixed this will aid in
vomiting, childbirth, urination and defecation.
Which of the following muscles extends the forearm and has its insertion on the ulna?
Which of the following muscles would be considered and antagonist to the rectus femoris?
Of the following muscles of the leg, which one is on the anterior side of the leg?
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